Calotype View of Workers Standing on a Cast Iron Lighthouse Assembled Temporarily at the Foundry Where it Was Created in Philadelphia Before Its Shipment For Installation on Carysfort Reef in Florida (1849)

Calotype view of workers standing on a cast iron lighthouse assembled temporarily at the foundry where it was created in Philadelphia before its shipment for installation on Carysfort Reef in Florida, August 2, 1849. By the Langenheim brothers.

Source.
Wikipedia entry.